body,
div,
dl,
dt,
dd,
ul,
ol,
li,
h1,
h2,
h3,
h4,
h5,
h6,
pre,
form,
fieldset,
legend,
input,
textarea,
button,
p,
blockquote,
th,
td {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}

body {
    background: #f1f1f1;
    text-align: center;
    font-family: Helvetica Neue, Helvetica, Arial, Microsoft Yahei, Hiragino Sans GB, Heiti SC, WenQuanYi Micro Hei, sans-serif;
}

li {
    list-style: none;
}

a {
    text-decoration: none;      /* 文字下划线 */
}

img {
    border: none;
}

input {
    outline: none;      /* 点击input边框 */
}